Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash and cash equivalents	$ 47,793	$ 99,167	[1]
Accounts receivable, net	149,224	137,807	[1]
Prepaid expenses	9,381	8,728	[1]
Inventories	5,162	4,526	[1]
Deferred income taxes	191	227	[1]
Other	8,056	7,457	[1]
Property and equipment, net	249,392	270,757	[1]
Goodwill	492,084	469,596	[1]
Intangible assets, net	74,434	81,680	[1]
Other assets	49,282	35,530	[1]
Accounts payable	59,397	57,635	[1]
Accrued expenses	140,061	82,609	[1]
Income taxes payable	1,814	2,114	[1]
Current portion of long-term debt	30,858	26,350	[1]
Long-term debt, less current portion	1,009,196	940,771	[1]
Other long-term liabilities	$ 39,861	$ 51,079	[1]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, Stated value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Preferred stock, shares issued (in shares)	385,000	385,000
Preferred stock, shares outstanding (in shares)	385,000	385,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	1,059	1,028
Common stock, shares outstanding (in shares)	1,059	1,028
Consolidated VIEs [Member]
Cash and cash equivalents	$ 7,700	$ 7,202
Accounts receivable, net	21,036	13,799
Prepaid expenses	559	651
Inventories	344	370
Deferred income taxes	6	6
Other	367	403
Property and equipment, net	22,412	19,051
Goodwill	52,454	54,377
Intangible assets, net	6,083	12,421
Other assets	6,261	6,335
Accounts payable	2,965	1,270
Accrued expenses	2,467	3,534
Income taxes payable	0	0
Current portion of long-term debt	62	14
Long-term debt, less current portion	174	11
Other long-term liabilities	$ 2,830	$ 2,474

[1] Derived from audited financial statements.